Add support for removing IPsec Transforms from Sockets

This patch add support to remove per-socket IPsec security policies.
This change is enabled by new support in the linux kernel to support
clearing socket policies using the IP_XFRM_POLICY sockopt.

Bug: 65688605
Test: runtest -x server/netd_unit_test.cpp

Change-Id: I7ce8ae6c6475a2e030966376fc3184efb76f2465
2 files changed